FTIR and WAXD Study of Regenerated Silk Fibroin

2013 ◽  
Vol 677 ◽  
pp. 211-215 ◽  
Author(s):  
Edwin Kamalha ◽  
Yuan Sheng Zheng ◽  
Yong Chun Zeng ◽  
Mutua N. Fredrick

In this study, regenerated Bombyx Mori (B. Mori ) silk fibroin from two aqueous solvents was analyzed for structural deviations. Results from Fourier transform infrared spectroscopy (FTIR) and Wide angle x-ray diffraction (WAXD) implied great alteration in the secondary structure, crystallinity and molecular weight due to the regeneration process.

2014 ◽  
Vol 787 ◽  
pp. 460-467 ◽  
Author(s):  
Jin Fa Ming ◽  
Xiao Xiao Yue ◽  
Feng Zhang ◽  
Yao Xing Jiang ◽  
Bao Qi Zuo

Silk fibroin/sodium alginate blend films and its hydroxyapatite deposition were prepared and characterized by scanning electron microscopy, wide angle X-ray diffraction, Fourier transform infrared analysis, and thermal analysis. The surface of blend films showed much more rod-like structure dispersing uniformity and its average length increasing from 181 to 803nm with increasing the contents of sodium alginate. The crystal structure of silk fibroin and the compatibility of the two components were associated with the content of sodium alginate in silk fibroin/sodium alginate blend films. The silk I and silk II crystal structures of silk fibroin were co-existed in the blend films and a rather complex conformation transition occurred, which was confirmed by wide angle X-ray diffraction and Fourier transform infrared analysis. Thermal behavior of blend films was interrupted by adding different contents of sodium alginate. Adding 30.0% sodium alginate or more, the endothermic peak of moisture evaporation shifted downward from 111 to 80°C, and the degradation peaks at 243 and 279°C, respectively, indicating an obviously two phase structure in the blend films. In addition, the rod-like HAp crystals were grown on the surface of blend films. This result may provide some new ideas in the design and fabrication of new materials through the silk fibroin/sodium alginate composite materials template for the hydroxyapatite crystal growth.


2012 ◽  
Vol 476-478 ◽  
pp. 2059-2062
Author(s):  
Chen Wang ◽  
Ya Dong Li ◽  
Gu Qiao Ding

Tributyl borate was first adopted for the introduction of boron in the preparation of bioactive borosilicate xerogel by sol-gel method. The xerogel reacted continuously in 0.25M K2HPO4 solution with a starting pH value of 7.0 at 37 °C for 1day. The structural, morphologies and compositional changes resulting from the conversion were characterized using X-ray diffraction, scanning electron microscopy and Fourier transform infrared spectroscopy. The results indicated that speed of formation of HA was cut way back on the time with the addition of boron and the induction period for the HA nucleation on the surface of the borosilicate xerogel was short than 1 days. The conversion mechanism of the borosilicate xerogels to hydroxyapaptite was also discussed.


2019 ◽  
Vol 29 (2) ◽  
Author(s):  
Mutia Dewi Yuniati ◽  
Feronika Cinthya Mawarni Putri Wawuru ◽  
Anggoro Tri Mursito ◽  
Iwan Setiawan ◽  
Lediyantje Lintjewas

Magnesite (MgCO3) is the main source for production of magnesium and its compound. In Indonesia, magnesite is quite rare and can be only found in limited amount in Padamarang Island, Southeast Sulawesi Provence. Thus the properties of magnesite and the reactivity degree of the obtained product are of technological importance. The aim of this work was to analyze the characteristics of Padamarang magnesite under calcination and hydrothermal treatment processes. The processes were carried out at various temperatures with range of 150-900°C for 30 minutes. The solids were characterized with respect to their chemical and physical properties by using scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), Fourier-transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). SEM image indicates that magnesite was formed from thin and flat hexagon sheets. The FTIR and XRD analysis disclose that MgO formed at temperature above 300°C, where as the magnesite sample also lost its mass around 50%. These results demonstrate that Padamarang magnesite decomposes to magnesium oxide and carbon dioxide at high temperature.Magnesit (MgCO3) merupakan sumber utama untuk produksi magnesium dan senyawa-senyawanya. Di Indonesia, magnesit cukup jarang dan hanya dapat ditemukan dalam jumlah yang terbatas di Pulau Padamarang, Propinsi Sulawesi Tenggara. Oleh karena itu sifat magnesit dan derajat reaktivitas dari produk-produk magnesit penting untuk diketahui. Penelitian ini bertujuan untuk menganalisis karakteristik magnesit Padamarang dengan perlakuan kalsinasi dan hidrothermal.  Proses dilakukan pada temperatur yang bervariasi dari 150-900°C selama 30 menit. Sifat kimia dan fisika dari magnesit dikarakterisasi dengan menggunakan scanning electron microscopy dengan energy-dispersive X-ray spectroscopy (SEM-EDX), Fourier-transform infrared spectroscopy (FTIR), dan X-ray diffraction (XRD). Gambar dari analisis SEM menunjukkan bahwa magnesit terbentuk dari lembaran-lembaran heksagonal yang tipis dan datar. Hasil analisis dengan FTIR dan XRD menunjukkan bahwa MgO terbentuk pada temperatur diatas 300°C, dimana sampel magnesit juga kehilangan massanya sekitar 50% pada suhu tersebut. Hal ini menunjukkan bahwa Magnesit Padamarang terdekomposisi menjadi magnesium oksida dan karbon dioksida pada temperatur tinggi.


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